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<a class="jxr_linenumber" name="1" href="#1">1</a>   <strong class="jxr_keyword">package</strong> net.big_oh.common.web.filters.ipaddress;
<a class="jxr_linenumber" name="2" href="#2">2</a>   
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> Copyright (c) 2009 Dave Wingate dba Big-Oh Software (www.big-oh.net)</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> Permission is hereby granted, free of charge, to any person</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> obtaining a copy of this software and associated documentation</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> files (the "Software"), to deal in the Software without</em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> restriction, including without limitation the rights to use,</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> copy, modify, merge, publish, distribute, sublicense, and/or sell</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> copies of the Software, and to permit persons to whom the</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> Software is furnished to do so, subject to the following</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> conditions:</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> The above copyright notice and this permission notice shall be</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <em class="jxr_comment"> included in all copies or substantial portions of the Software.</em>
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <em class="jxr_comment"> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,</em>
<a class="jxr_linenumber" name="19" href="#19">19</a>  <em class="jxr_comment"> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES</em>
<a class="jxr_linenumber" name="20" href="#20">20</a>  <em class="jxr_comment"> OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</em>
<a class="jxr_linenumber" name="21" href="#21">21</a>  <em class="jxr_comment"> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT</em>
<a class="jxr_linenumber" name="22" href="#22">22</a>  <em class="jxr_comment"> HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,</em>
<a class="jxr_linenumber" name="23" href="#23">23</a>  <em class="jxr_comment"> WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</em>
<a class="jxr_linenumber" name="24" href="#24">24</a>  <em class="jxr_comment"> FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR</em>
<a class="jxr_linenumber" name="25" href="#25">25</a>  <em class="jxr_comment"> OTHER DEALINGS IN THE SOFTWARE.</em>
<a class="jxr_linenumber" name="26" href="#26">26</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="27" href="#27">27</a>  
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> java.lang.reflect.Constructor;
<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> java.lang.reflect.InvocationTargetException;
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> java.net.InetAddress;
<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> java.util.Enumeration;
<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> java.util.HashSet;
<a class="jxr_linenumber" name="34" href="#34">34</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
<a class="jxr_linenumber" name="35" href="#35">35</a>  
<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> javax.servlet.Filter;
<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">import</strong> javax.servlet.FilterChain;
<a class="jxr_linenumber" name="38" href="#38">38</a>  <strong class="jxr_keyword">import</strong> javax.servlet.FilterConfig;
<a class="jxr_linenumber" name="39" href="#39">39</a>  <strong class="jxr_keyword">import</strong> javax.servlet.ServletException;
<a class="jxr_linenumber" name="40" href="#40">40</a>  <strong class="jxr_keyword">import</strong> javax.servlet.ServletRequest;
<a class="jxr_linenumber" name="41" href="#41">41</a>  <strong class="jxr_keyword">import</strong> javax.servlet.ServletResponse;
<a class="jxr_linenumber" name="42" href="#42">42</a>  <strong class="jxr_keyword">import</strong> javax.servlet.http.HttpServletResponse;
<a class="jxr_linenumber" name="43" href="#43">43</a>  
<a class="jxr_linenumber" name="44" href="#44">44</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.logging.Log;
<a class="jxr_linenumber" name="45" href="#45">45</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.logging.LogFactory;
<a class="jxr_linenumber" name="46" href="#46">46</a>  
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> * A filter that supports securing a web application so that only certain IP</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> * addresses may access it. This filter supports two type of rules: black list</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> * rules &amp; white list rules. A request that matches a white list rule will</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> * ignore any matching black list rule, allowing the request to process</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> * normally.</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> * </em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * @author dwingate</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> * </em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../net/big_oh/common/web/filters/ipaddress/IPAddressFilter.html">IPAddressFilter</a> <strong class="jxr_keyword">implements</strong> Filter
<a class="jxr_linenumber" name="58" href="#58">58</a>  {
<a class="jxr_linenumber" name="59" href="#59">59</a>  
<a class="jxr_linenumber" name="60" href="#60">60</a>  	<strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Log logger = LogFactory.getLog(IPAddressFilter.<strong class="jxr_keyword">class</strong>);
<a class="jxr_linenumber" name="61" href="#61">61</a>  
<a class="jxr_linenumber" name="62" href="#62">62</a>  	<strong class="jxr_keyword">private</strong> Set&lt;IPAddressWhiteListFilterRule&gt; whiteListRules;
<a class="jxr_linenumber" name="63" href="#63">63</a>  	<strong class="jxr_keyword">private</strong> Set&lt;IPAddressBlackListFilterRule&gt; blackListRules;
<a class="jxr_linenumber" name="64" href="#64">64</a>  
<a class="jxr_linenumber" name="65" href="#65">65</a>  	<strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> init(FilterConfig filterConfig) <strong class="jxr_keyword">throws</strong> ServletException
<a class="jxr_linenumber" name="66" href="#66">66</a>  	{
<a class="jxr_linenumber" name="67" href="#67">67</a>  		whiteListRules = <strong class="jxr_keyword">new</strong> HashSet&lt;IPAddressWhiteListFilterRule&gt;();
<a class="jxr_linenumber" name="68" href="#68">68</a>  		blackListRules = <strong class="jxr_keyword">new</strong> HashSet&lt;IPAddressBlackListFilterRule&gt;();
<a class="jxr_linenumber" name="69" href="#69">69</a>  
<a class="jxr_linenumber" name="70" href="#70">70</a>  		<em class="jxr_comment">// Add rules defined in filter config</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>  		initIPAddressFilteringRules(filterConfig);
<a class="jxr_linenumber" name="72" href="#72">72</a>  
<a class="jxr_linenumber" name="73" href="#73">73</a>  		<em class="jxr_comment">// Add programmatically-defined rules</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>  		initIPAddressFilteringRules();
<a class="jxr_linenumber" name="75" href="#75">75</a>  
<a class="jxr_linenumber" name="76" href="#76">76</a>  	}
<a class="jxr_linenumber" name="77" href="#77">77</a>  
<a class="jxr_linenumber" name="78" href="#78">78</a>  	@SuppressWarnings(value = <span class="jxr_string">"unchecked"</span>)
<a class="jxr_linenumber" name="79" href="#79">79</a>  	<strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> initIPAddressFilteringRules(FilterConfig filterConfig)
<a class="jxr_linenumber" name="80" href="#80">80</a>  	{
<a class="jxr_linenumber" name="81" href="#81">81</a>  
<a class="jxr_linenumber" name="82" href="#82">82</a>  		Enumeration&lt;String&gt; filterInitParamNames = filterConfig.getInitParameterNames();
<a class="jxr_linenumber" name="83" href="#83">83</a>  		<strong class="jxr_keyword">while</strong> (filterInitParamNames.hasMoreElements())
<a class="jxr_linenumber" name="84" href="#84">84</a>  		{
<a class="jxr_linenumber" name="85" href="#85">85</a>  			String initParamName = filterInitParamNames.nextElement();
<a class="jxr_linenumber" name="86" href="#86">86</a>  			String initParamValue = filterConfig.getInitParameter(initParamName);
<a class="jxr_linenumber" name="87" href="#87">87</a>  
<a class="jxr_linenumber" name="88" href="#88">88</a>  			<strong class="jxr_keyword">if</strong> (initParamName.indexOf(<span class="jxr_string">"."</span>) != -1)
<a class="jxr_linenumber" name="89" href="#89">89</a>  			{
<a class="jxr_linenumber" name="90" href="#90">90</a>  
<a class="jxr_linenumber" name="91" href="#91">91</a>  				IPAddressFilterRule newFilterRuleFromFilterConfigParam = instantiateIPAddressFilterRule(initParamName, initParamValue);
<a class="jxr_linenumber" name="92" href="#92">92</a>  
<a class="jxr_linenumber" name="93" href="#93">93</a>  				<strong class="jxr_keyword">if</strong> (newFilterRuleFromFilterConfigParam != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="94" href="#94">94</a>  				{
<a class="jxr_linenumber" name="95" href="#95">95</a>  					registerFilterRuleWithFilter(newFilterRuleFromFilterConfigParam);
<a class="jxr_linenumber" name="96" href="#96">96</a>  				}
<a class="jxr_linenumber" name="97" href="#97">97</a>  
<a class="jxr_linenumber" name="98" href="#98">98</a>  			}
<a class="jxr_linenumber" name="99" href="#99">99</a>  			<strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="100" href="#100">100</a> 			{
<a class="jxr_linenumber" name="101" href="#101">101</a> 				logger.warn(<span class="jxr_string">"Ignoring filter init parameter '"</span> + initParamName + <span class="jxr_string">"' because it doesn't seem to be the name of a Class."</span>);
<a class="jxr_linenumber" name="102" href="#102">102</a> 			}
<a class="jxr_linenumber" name="103" href="#103">103</a> 		}
<a class="jxr_linenumber" name="104" href="#104">104</a> 
<a class="jxr_linenumber" name="105" href="#105">105</a> 	}
<a class="jxr_linenumber" name="106" href="#106">106</a> 
<a class="jxr_linenumber" name="107" href="#107">107</a> 	<em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment">	 * A hook that child classes can use to add filter rules that were not</em>
<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment">	 * defined in the FilterConfig.</em>
<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment">	 */</em>
<a class="jxr_linenumber" name="111" href="#111">111</a> 	<strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> initIPAddressFilteringRules()
<a class="jxr_linenumber" name="112" href="#112">112</a> 	{
<a class="jxr_linenumber" name="113" href="#113">113</a> 		<em class="jxr_comment">// override as needed.</em>
<a class="jxr_linenumber" name="114" href="#114">114</a> 	}
<a class="jxr_linenumber" name="115" href="#115">115</a> 
<a class="jxr_linenumber" name="116" href="#116">116</a> 	<strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">boolean</strong> registerFilterRuleWithFilter(<a href="../../../../../../net/big_oh/common/web/filters/ipaddress/IPAddressFilterRule.html">IPAddressFilterRule</a> filterRule)
<a class="jxr_linenumber" name="117" href="#117">117</a> 	{
<a class="jxr_linenumber" name="118" href="#118">118</a> 
<a class="jxr_linenumber" name="119" href="#119">119</a> 		<strong class="jxr_keyword">boolean</strong> addedRuleSomewhere = false;
<a class="jxr_linenumber" name="120" href="#120">120</a> 
<a class="jxr_linenumber" name="121" href="#121">121</a> 		<strong class="jxr_keyword">if</strong> (IPAddressWhiteListFilterRule.<strong class="jxr_keyword">class</strong>.isAssignableFrom(filterRule.getClass()))
<a class="jxr_linenumber" name="122" href="#122">122</a> 		{
<a class="jxr_linenumber" name="123" href="#123">123</a> 			whiteListRules.add((IPAddressWhiteListFilterRule) filterRule);
<a class="jxr_linenumber" name="124" href="#124">124</a> 			addedRuleSomewhere = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="125" href="#125">125</a> 		}
<a class="jxr_linenumber" name="126" href="#126">126</a> 
<a class="jxr_linenumber" name="127" href="#127">127</a> 		<strong class="jxr_keyword">if</strong> (IPAddressBlackListFilterRule.<strong class="jxr_keyword">class</strong>.isAssignableFrom(filterRule.getClass()))
<a class="jxr_linenumber" name="128" href="#128">128</a> 		{
<a class="jxr_linenumber" name="129" href="#129">129</a> 			blackListRules.add((IPAddressBlackListFilterRule) filterRule);
<a class="jxr_linenumber" name="130" href="#130">130</a> 			addedRuleSomewhere = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="131" href="#131">131</a> 		}
<a class="jxr_linenumber" name="132" href="#132">132</a> 
<a class="jxr_linenumber" name="133" href="#133">133</a> 		<strong class="jxr_keyword">if</strong> (!addedRuleSomewhere)
<a class="jxr_linenumber" name="134" href="#134">134</a> 		{
<a class="jxr_linenumber" name="135" href="#135">135</a> 			logger.warn(IPAddressFilterRule.<strong class="jxr_keyword">class</strong>.getSimpleName() + <span class="jxr_string">" ("</span> + filterRule.toString() + <span class="jxr_string">") is an unexpected type; ignoring."</span>);
<a class="jxr_linenumber" name="136" href="#136">136</a> 		}
<a class="jxr_linenumber" name="137" href="#137">137</a> 		<strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="138" href="#138">138</a> 		{
<a class="jxr_linenumber" name="139" href="#139">139</a> 			logger.info(<span class="jxr_string">"Registered new filter rule ("</span> + filterRule.toString() + <span class="jxr_string">")."</span>);
<a class="jxr_linenumber" name="140" href="#140">140</a> 		}
<a class="jxr_linenumber" name="141" href="#141">141</a> 
<a class="jxr_linenumber" name="142" href="#142">142</a> 		<strong class="jxr_keyword">return</strong> addedRuleSomewhere;
<a class="jxr_linenumber" name="143" href="#143">143</a> 
<a class="jxr_linenumber" name="144" href="#144">144</a> 	}
<a class="jxr_linenumber" name="145" href="#145">145</a> 
<a class="jxr_linenumber" name="146" href="#146">146</a> 	<strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> destroy()
<a class="jxr_linenumber" name="147" href="#147">147</a> 	{
<a class="jxr_linenumber" name="148" href="#148">148</a> 	}
<a class="jxr_linenumber" name="149" href="#149">149</a> 
<a class="jxr_linenumber" name="150" href="#150">150</a> 	<strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> doFilter(ServletRequest request, ServletResponse response, FilterChain chain) <strong class="jxr_keyword">throws</strong> IOException, ServletException
<a class="jxr_linenumber" name="151" href="#151">151</a> 	{
<a class="jxr_linenumber" name="152" href="#152">152</a> 
<a class="jxr_linenumber" name="153" href="#153">153</a> 		<strong class="jxr_keyword">if</strong> (response instanceof HttpServletResponse)
<a class="jxr_linenumber" name="154" href="#154">154</a> 		{
<a class="jxr_linenumber" name="155" href="#155">155</a> 
<a class="jxr_linenumber" name="156" href="#156">156</a> 			HttpServletResponse resp = (HttpServletResponse) response;
<a class="jxr_linenumber" name="157" href="#157">157</a> 
<a class="jxr_linenumber" name="158" href="#158">158</a> 			<em class="jxr_comment">// check white list rules</em>
<a class="jxr_linenumber" name="159" href="#159">159</a> 			<strong class="jxr_keyword">for</strong> (IPAddressWhiteListFilterRule whiteListRule : whiteListRules)
<a class="jxr_linenumber" name="160" href="#160">160</a> 			{
<a class="jxr_linenumber" name="161" href="#161">161</a> 				<strong class="jxr_keyword">if</strong> (whiteListRule.doesRequestingAddressMatchRule(InetAddress.getByName(request.getRemoteAddr())))
<a class="jxr_linenumber" name="162" href="#162">162</a> 				{
<a class="jxr_linenumber" name="163" href="#163">163</a> 					logger.info(<span class="jxr_string">"Request from "</span> + request.getRemoteAddr() + <span class="jxr_string">" permitted because of matching white list rule ("</span> + whiteListRule.toString() + <span class="jxr_string">")."</span>);
<a class="jxr_linenumber" name="164" href="#164">164</a> 					chain.doFilter(request, response);
<a class="jxr_linenumber" name="165" href="#165">165</a> 					<strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="166" href="#166">166</a> 				}
<a class="jxr_linenumber" name="167" href="#167">167</a> 			}
<a class="jxr_linenumber" name="168" href="#168">168</a> 
<a class="jxr_linenumber" name="169" href="#169">169</a> 			<em class="jxr_comment">// check blacklist rules</em>
<a class="jxr_linenumber" name="170" href="#170">170</a> 			<strong class="jxr_keyword">for</strong> (IPAddressBlackListFilterRule blackListRule : blackListRules)
<a class="jxr_linenumber" name="171" href="#171">171</a> 			{
<a class="jxr_linenumber" name="172" href="#172">172</a> 				<strong class="jxr_keyword">if</strong> (blackListRule.doesRequestingAddressMatchRule(InetAddress.getByName(request.getRemoteAddr())))
<a class="jxr_linenumber" name="173" href="#173">173</a> 				{
<a class="jxr_linenumber" name="174" href="#174">174</a> 					logger.info(<span class="jxr_string">"Request from "</span> + request.getRemoteAddr() + <span class="jxr_string">" rejected because of matching black list rule ("</span> + blackListRule.toString() + <span class="jxr_string">")."</span>);
<a class="jxr_linenumber" name="175" href="#175">175</a> 					resp.setStatus(HttpServletResponse.SC_FORBIDDEN);
<a class="jxr_linenumber" name="176" href="#176">176</a> 					<strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="177" href="#177">177</a> 				}
<a class="jxr_linenumber" name="178" href="#178">178</a> 			}
<a class="jxr_linenumber" name="179" href="#179">179</a> 
<a class="jxr_linenumber" name="180" href="#180">180</a> 			logger.info(<span class="jxr_string">"Request from "</span> + request.getRemoteAddr() + <span class="jxr_string">" permitted because no matching rules were found."</span>);
<a class="jxr_linenumber" name="181" href="#181">181</a> 			chain.doFilter(request, response);
<a class="jxr_linenumber" name="182" href="#182">182</a> 			<strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="183" href="#183">183</a> 
<a class="jxr_linenumber" name="184" href="#184">184</a> 		}
<a class="jxr_linenumber" name="185" href="#185">185</a> 		<strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="186" href="#186">186</a> 		{
<a class="jxr_linenumber" name="187" href="#187">187</a> 			logger.info(<span class="jxr_string">"Encountered a non-HTTP request.  Processing normally."</span>);
<a class="jxr_linenumber" name="188" href="#188">188</a> 			chain.doFilter(request, response);
<a class="jxr_linenumber" name="189" href="#189">189</a> 			<strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="190" href="#190">190</a> 		}
<a class="jxr_linenumber" name="191" href="#191">191</a> 
<a class="jxr_linenumber" name="192" href="#192">192</a> 	}
<a class="jxr_linenumber" name="193" href="#193">193</a> 
<a class="jxr_linenumber" name="194" href="#194">194</a> 	<strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../../../net/big_oh/common/web/filters/ipaddress/IPAddressFilterRule.html">IPAddressFilterRule</a> instantiateIPAddressFilterRule(String className, String constructorParam)
<a class="jxr_linenumber" name="195" href="#195">195</a> 	{
<a class="jxr_linenumber" name="196" href="#196">196</a> 
<a class="jxr_linenumber" name="197" href="#197">197</a> 		IPAddressFilterRule newIPAddressFilterRule = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="198" href="#198">198</a> 
<a class="jxr_linenumber" name="199" href="#199">199</a> 		<strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="200" href="#200">200</a> 		{
<a class="jxr_linenumber" name="201" href="#201">201</a> 			<em class="jxr_comment">// Get the class declared in the FilterConfig parameter.</em>
<a class="jxr_linenumber" name="202" href="#202">202</a> 			Class&lt;?&gt; filterRuleClass = Class.forName(className);
<a class="jxr_linenumber" name="203" href="#203">203</a> 
<a class="jxr_linenumber" name="204" href="#204">204</a> 			<em class="jxr_comment">// Try to instantiate an instance of the IPAddressFilterRule class</em>
<a class="jxr_linenumber" name="205" href="#205">205</a> 			<em class="jxr_comment">// Look for an appropriate constructor that takes a single</em>
<a class="jxr_linenumber" name="206" href="#206">206</a> 			<em class="jxr_comment">// java.lang.String</em>
<a class="jxr_linenumber" name="207" href="#207">207</a> 			Constructor&lt;?&gt; constructor = filterRuleClass.getConstructor(String.<strong class="jxr_keyword">class</strong>);
<a class="jxr_linenumber" name="208" href="#208">208</a> 
<a class="jxr_linenumber" name="209" href="#209">209</a> 			newIPAddressFilterRule = (IPAddressFilterRule) constructor.newInstance(constructorParam);
<a class="jxr_linenumber" name="210" href="#210">210</a> 		}
<a class="jxr_linenumber" name="211" href="#211">211</a> 		<strong class="jxr_keyword">catch</strong> (ClassNotFoundException cnfe)
<a class="jxr_linenumber" name="212" href="#212">212</a> 		{
<a class="jxr_linenumber" name="213" href="#213">213</a> 			logger.error(<span class="jxr_string">"Could not find a class named "</span> + className);
<a class="jxr_linenumber" name="214" href="#214">214</a> 		}
<a class="jxr_linenumber" name="215" href="#215">215</a> 		<strong class="jxr_keyword">catch</strong> (NoSuchMethodException e)
<a class="jxr_linenumber" name="216" href="#216">216</a> 		{
<a class="jxr_linenumber" name="217" href="#217">217</a> 			logger.error(<span class="jxr_string">"Could not instantiate an instance of class "</span> + className + <span class="jxr_string">"."</span>);
<a class="jxr_linenumber" name="218" href="#218">218</a> 			logger.error(e);
<a class="jxr_linenumber" name="219" href="#219">219</a> 		}
<a class="jxr_linenumber" name="220" href="#220">220</a> 		<strong class="jxr_keyword">catch</strong> (InstantiationException e)
<a class="jxr_linenumber" name="221" href="#221">221</a> 		{
<a class="jxr_linenumber" name="222" href="#222">222</a> 			logger.error(<span class="jxr_string">"Could not instantiate an instance of class "</span> + className + <span class="jxr_string">"."</span>);
<a class="jxr_linenumber" name="223" href="#223">223</a> 			logger.error(e);
<a class="jxr_linenumber" name="224" href="#224">224</a> 		}
<a class="jxr_linenumber" name="225" href="#225">225</a> 		<strong class="jxr_keyword">catch</strong> (IllegalAccessException e)
<a class="jxr_linenumber" name="226" href="#226">226</a> 		{
<a class="jxr_linenumber" name="227" href="#227">227</a> 			logger.error(<span class="jxr_string">"Could not instantiate an instance of class "</span> + className + <span class="jxr_string">"."</span>);
<a class="jxr_linenumber" name="228" href="#228">228</a> 			logger.error(e);
<a class="jxr_linenumber" name="229" href="#229">229</a> 		}
<a class="jxr_linenumber" name="230" href="#230">230</a> 		<strong class="jxr_keyword">catch</strong> (InvocationTargetException e)
<a class="jxr_linenumber" name="231" href="#231">231</a> 		{
<a class="jxr_linenumber" name="232" href="#232">232</a> 			logger.error(<span class="jxr_string">"Could not instantiate an instance of class "</span> + className + <span class="jxr_string">"."</span>);
<a class="jxr_linenumber" name="233" href="#233">233</a> 			logger.error(e);
<a class="jxr_linenumber" name="234" href="#234">234</a> 		}
<a class="jxr_linenumber" name="235" href="#235">235</a> 		<strong class="jxr_keyword">catch</strong> (RuntimeException e)
<a class="jxr_linenumber" name="236" href="#236">236</a> 		{
<a class="jxr_linenumber" name="237" href="#237">237</a> 			logger.error(<span class="jxr_string">"Could not instantiate an instance of class "</span> + className + <span class="jxr_string">"."</span>);
<a class="jxr_linenumber" name="238" href="#238">238</a> 			logger.error(e);
<a class="jxr_linenumber" name="239" href="#239">239</a> 		}
<a class="jxr_linenumber" name="240" href="#240">240</a> 
<a class="jxr_linenumber" name="241" href="#241">241</a> 		<strong class="jxr_keyword">return</strong> newIPAddressFilterRule;
<a class="jxr_linenumber" name="242" href="#242">242</a> 
<a class="jxr_linenumber" name="243" href="#243">243</a> 	}
<a class="jxr_linenumber" name="244" href="#244">244</a> 
<a class="jxr_linenumber" name="245" href="#245">245</a> }
</pre>
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